Piston construction



Dec. 11, 1934. Asco PISTON CONSTRUCTION Filed June 13, 1933 2 Sheets-Sheet 1 ElEnl.

Ll/lllll INVENTOR. .STEYEH HIBHSCQ TTORNEYS.

Dec. 11, 1934.

s. HIBASCO PI STON CONSTRUCTION Filed Jun 15, 1933 2 Sheets-Sheet 2 INVENTOR. STEYEJYHIBH sec). 7 BY C; G

ATTORNEYS.

Patented Dec. 11, 1934 UNITED STATES PATENT OFFICE Application June 13,

1 Claim.

This invention relates to improvements in pistons.

The principal object of this invention is to produce a piston which will be more efiicient than the ordinary solid piston now in use.

Another object of the present invention is to provide a piston which is economical to manufacture.

A further object is to produce a piston wherein the same will more closely fit the interior of the cylinder thereby preventing piston slap.

A still further object is to provide a piston wherein a minimum oil leakage will take place.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Fig. 1 is a vertical cross-section of my improved piston,

Fig. 2 is a bottom plan view of Fig. 1,

Fig. 3 is a side elevation of Fig. 1, and

Fig. 4 is a top plan view of Fig. 3.

In internal combustion engines a piston is employed which piston carries rings upon its outer surface for the purpose of acting as a seal against the explosive force above the piston head. These pistons have been made of a solid casting with the result that after a short time the wear upon the piston causes it to be of less size than the diameter of the cylinder, and as a result at high speeds the piston would vibrate in a manner known as a piston slap.

Applicant has therefore devised a piston made of two halves having an internal spring for the purpose of moving the two halves away from each other or against the wall of the cylinder and has arranged the head of the cylinder in such a manner that while it is a divided head and capable of movement, an effective seal results and therefore there is no leakage from the explosion chamber to the point below the cylinder.

In the accompanying drawings, wherein for the purpose of illustration is shown a preferred em- 1933, Serial No. 675,592

bodiment of my invention the numerals 5 and 6 refer to the two halves of the piston which are substantially semi-circular in shape as best shown in Fig. 4. Each of the sections has a head portion as shown at 7 and 8 of Fig. l, the head portions are semi-circular in shape (see Fig. 4) and are further provided with inner lapping portions which carry the halves beyond the center of the piston with the result that it is necessary to relieve both sections along their sides as shown at 9 and 11, thus forming depressed areas lengthwise of this portion.

This relieving portion is closed by the piston rings 12 and 13, best shown in Fig. 2. The overlapping portions of the sections '7 and 8 are designated by the numerals 14 and 16, respectively. In order to move the two halves of the piston away from each other or toward the side wall of the cylinder, an expansion spring 18 is employed, the action of which is obvious. The customary wrist pin 17 serves to connect the two halves of the piston to the usual connecting rod.

It will be thus seen that a piston constructed in accordance with my invention will perform all of the objects above set forth and at the same time function in the manner of an ordinary piston.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred-example of the same and that various changes relative to the shape, size, material and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claim.

Having thus described my invention, I claim In a piston of the character described, a pair of substantially semi-cylindrical sections adapted to abut each other, each of said sections having a head substantially semi-circular in area and adapted to over-lap each other, of an expansion ring positioned within said piston, and depressed areas formed lengthwise of said piston at a point' adjacent the abutting edges of each ofsaid cylindri'cal sections.

STEVEN HlIBASCO. 

